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Hou MH, Wang YC, Yang CS, Liao KF, Chang JW, Shih O, Yeh YQ, Sriramoju MK, Weng TW, Jeng US, Hsu STD, Chen Y. Structural insights into the regulation, ligand recognition, and oligomerization of bacterial STING. Nat Commun 2023; 14:8519. [PMID: 38129386 PMCID: PMC10739871 DOI: 10.1038/s41467-023-44052-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 11/28/2023] [Indexed: 12/23/2023] Open
Abstract
The cyclic GMP-AMP synthase (cGAS)/stimulator of interferon gene (STING) signaling pathway plays a critical protective role against viral infections. Metazoan STING undergoes multilayers of regulation to ensure specific signal transduction. However, the mechanisms underlying the regulation of bacterial STING remain unclear. In this study, we determined the crystal structure of anti-parallel dimeric form of bacterial STING, which keeps itself in an inactive state by preventing cyclic dinucleotides access. Conformational transition between inactive and active states of bacterial STINGs provides an on-off switch for downstream signaling. Some bacterial STINGs living in extreme environment contain an insertion sequence, which we show codes for an additional long lid that covers the ligand-binding pocket. This lid helps regulate anti-phage activities. Furthermore, bacterial STING can bind cyclic di-AMP in a triangle-shaped conformation via a more compact ligand-binding pocket, forming spiral-shaped protofibrils and higher-order fibril filaments. Based on the differences between cyclic-dinucleotide recognition, oligomerization, and downstream activation of different bacterial STINGs, we proposed a model to explain structure-function evolution of bacterial STINGs.
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Grants
- National Science and Technology Council, Taiwan, 109-2311-B241-001 National Science and Technology Council, Taiwan, 111-2311-B-039-001-MY3
- National Science and Technology Council, Taiwan, 111-2811-M-001-125
- National Science and Technology Council, Taiwan, 110-2113-M-001-050-MY3 National Science and Technology Council, Taiwan, 110-2311-B-001-013-MY3 Academia Sinica intramural fund, an Academia Sinica Career Development Award, Academia Sinica, AS-CDA-109-L08 Infectious Disease Research Supporting Grant, AS-IDR-110-08.
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Affiliation(s)
- Mei-Hui Hou
- Genomics BioSci. & Tech. Co. Ltd., New Taipei, 221411, Taiwan
| | - Yu-Chuan Wang
- Genomics BioSci. & Tech. Co. Ltd., New Taipei, 221411, Taiwan
| | - Chia-Shin Yang
- Genomics BioSci. & Tech. Co. Ltd., New Taipei, 221411, Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Je-Wei Chang
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, 300092, Taiwan
| | | | - Tzu-Wen Weng
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115024, Taiwan
- Institute of Biochemical Sciences, National Taiwan University, Taipei, 106319, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu, 300092, Taiwan
- Department of Chemical Engineering & College of Semiconductor Research, National Tsing Hua University, Hsinchu, 300044, Taiwan
| | - Shang-Te Danny Hsu
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115024, Taiwan
- Institute of Biochemical Sciences, National Taiwan University, Taipei, 106319, Taiwan
| | - Yeh Chen
- Department of Food Science and Biotechnology, National Chung Hsing University, Taichung, 402202, Taiwan.
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2
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EswarKumar N, Yang CH, Tewary S, Peng WH, Chen GC, Yeh YQ, Yang HC, Ho MC. An integrative approach unveils a distal encounter site for rPTPε and phospho-Src complex formation. Structure 2023; 31:1567-1577.e5. [PMID: 37794594 DOI: 10.1016/j.str.2023.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/10/2023] [Accepted: 09/07/2023] [Indexed: 10/06/2023]
Abstract
The structure determination of protein tyrosine phosphatase (PTP): phospho-protein complexes, which is essential to understand how specificity is achieved at the amino acid level, remains a significant challenge for protein crystallography and cryoEM due to the transient nature of binding interactions. Using rPTPεD1 and phospho-SrcKD as a model system, we have established an integrative workflow to address this problem, by means of which we generate a protein:phospho-protein complex model using predetermined protein structures, SAXS and pTyr-tailored MD simulations. Our model reveals transient protein-protein interactions between rPTPεD1 and phospho-SrcKD and is supported by three independent experimental validations. Measurements of the association rate between rPTPεD1 and phospho-SrcKD showed that mutations on the rPTPεD1: SrcKD complex interface disrupts these transient interactions, resulting in a reduction in protein-protein association rate and, eventually, phosphatase activity. This integrative approach is applicable to other PTP: phospho-protein complexes and the characterization of transient protein-protein interface interactions.
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Affiliation(s)
- Nadendla EswarKumar
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan; Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Cheng-Han Yang
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan; Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan
| | - Sunilkumar Tewary
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan
| | - Wen-Hsin Peng
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan
| | - Guang-Chao Chen
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsin-Chu 300, Taiwan
| | - Hsiao-Ching Yang
- Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.
| | - Meng-Chiao Ho
- Institute of Biological Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 115, Taiwan; Institute of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan.
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3
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Hsu TW, Yang CH, Su CJ, Huang YT, Yeh YQ, Liao KF, Lin TC, Shih O, Lee MT, Su AC, Jeng US. Revealing cholesterol effects on PEGylated HSPC liposomes using AF4-MALS and simultaneous small- and wide-angle X-ray scattering. J Appl Crystallogr 2023; 56:988-993. [PMID: 37555211 PMCID: PMC10405602 DOI: 10.1107/s1600576723005393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 06/16/2023] [Indexed: 08/10/2023] Open
Abstract
Liposome development is of great interest owing to increasing requirements for efficient drug carriers. The structural features and thermal stability of such liposomes are crucial in drug transport and delivery. Reported here are the results of the structural characterization of PEGylated liposomes via small- and wide-angle X-ray scattering and an asymmetric flow field-flow fractionation (AF4) system coupled with differential refractive-index detection, multi-angle light scattering (MALS) and dynamic light scattering. This integrated analysis of the exemplar PEGylated liposome formed from hydrogenated soy phosphatid-yl-choline (HSPC) with the addition of cholesterol reveals an average hydro-dynamic radius (R h) of 52 nm with 10% polydispersity, a comparable radius of gyration (R g) and a major liposome particle mass of 118 kDa. The local bilayer structure of the liposome is found to have asymmetric electronic density profiles in the inner and outer leaflets, sandwiched by two PEGylated outer layers ca 5 nm thick. Cholesterol was found to effectively intervene in lipid chain packing, resulting in the thickening of the liposome bilayer, an increase in the area per lipid and an increase in liposome size, especially in the fluid phase of the liposome. These cholesterol effects show signs of saturation at cholesterol concentrations above ca 1:5 cholesterol:lipid molar ratio.
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Affiliation(s)
- Ting-Wei Hsu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Ching-Hsun Yang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Yin-Tzu Huang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Tien-Chang Lin
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Ming-Tao Lee
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
- Department of Physics, National Central University, Zhongli 320317, Taiwan
| | - An-Chung Su
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
- College of Semiconductor Research, National Tsing Hua University, Hsinchu 300044, Taiwan
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Chen NC, Wang CH, Yoshimura M, Yeh YQ, Guan HH, Chuankhayan P, Lin CC, Lin PJ, Huang YC, Wakatsuki S, Ho MC, Chen CJ. Structures of honeybee-infecting Lake Sinai virus reveal domain functions and capsid assembly with dynamic motions. Nat Commun 2023; 14:545. [PMID: 36726015 PMCID: PMC9892032 DOI: 10.1038/s41467-023-36235-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 01/18/2023] [Indexed: 02/03/2023] Open
Abstract
Understanding the structural diversity of honeybee-infecting viruses is critical to maintain pollinator health and manage the spread of diseases in ecology and agriculture. We determine cryo-EM structures of T = 4 and T = 3 capsids of virus-like particles (VLPs) of Lake Sinai virus (LSV) 2 and delta-N48 LSV1, belonging to tetraviruses, at resolutions of 2.3-2.6 Å in various pH environments. Structural analysis shows that the LSV2 capsid protein (CP) structural features, particularly the protruding domain and C-arm, differ from those of other tetraviruses. The anchor loop on the central β-barrel domain interacts with the neighboring subunit to stabilize homo-trimeric capsomeres during assembly. Delta-N48 LSV1 CP interacts with ssRNA via the rigid helix α1', α1'-α1 loop, β-barrel domain, and C-arm. Cryo-EM reconstructions, combined with X-ray crystallographic and small-angle scattering analyses, indicate that pH affects capsid conformations by regulating reversible dynamic particle motions and sizes of LSV2 VLPs. C-arms exist in all LSV2 and delta-N48 LSV1 VLPs across varied pH conditions, indicating that autoproteolysis cleavage is not required for LSV maturation. The observed linear domino-scaffold structures of various lengths, made up of trapezoid-shape capsomeres, provide a basis for icosahedral T = 4 and T = 3 architecture assemblies. These findings advance understanding of honeybee-infecting viruses that can cause Colony Collapse Disorder.
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Affiliation(s)
- Nai-Chi Chen
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Chun-Hsiung Wang
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan, ROC
| | - Masato Yoshimura
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Yi-Qi Yeh
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Hong-Hsiang Guan
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Phimonphan Chuankhayan
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Chien-Chih Lin
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Pei-Ju Lin
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC.,Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30043, Taiwan, ROC
| | - Yen-Chieh Huang
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC
| | - Soichi Wakatsuki
- Department of Structural Biology, Stanford University, Stanford, CA, 94305, USA.,SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Structural Molecular Biology, Menlo Park, CA, 94025, USA
| | - Meng-Chiao Ho
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan, ROC.
| | - Chun-Jung Chen
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC. .,Department of Physics, National Tsing Hua University, Hsinchu, 30043, Taiwan, ROC. .,Department of Biotechnology and Bioindustry Sciences, National Cheng Kung University, Tainan, 701, Taiwan, ROC. .,Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan, ROC.
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5
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Septani CM, Shih O, Yeh YQ, Sun YS. Structural Evolution of a Polystyrene- Block-Poly(Ethylene Oxide) Block Copolymer in Tetrahydrofuran/Water Cosolvents. Langmuir 2022; 38:5987-5995. [PMID: 35507040 DOI: 10.1021/acs.langmuir.2c00041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This study aims to quantitatively investigate the effect of water content on the self-assembly behavior of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) in tetrahydrofuran/water cosolvents by small-angle X-ray scattering. PS-b-PEO chains preferentially form fractal aggregates at a dilute concentration in neat tetrahydrofuran (THF). By adding a small amount of water into THF, PS-b-PEO forms gelled networks. The gelled networks have correlated inhomogeneities, which were generated through mesophase separation. These gelled networks are not present when PS-b-PEO is dissolved in THF/methanol and THF/ethanol cosolvents. The substitution of water with 12 M HCl reduces the viscosity of the gelled networks. Those results indicate that the gelled networks of PS-b-PEO need hydrogen bonds formed from surrounding water molecules to be bridging agents, which connect different PEO block chains together. Upon increasing the water content in THF/water cosolvents, dispersed micelles with a core-shell conformation or aggregated micelles preferentially coexist with fractal aggregates.
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Affiliation(s)
- Cindy Mutiara Septani
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Ya-Sen Sun
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
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6
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Yeh YQ, Liao KF, Shih O, Wu WR, Su CJ, Jeng US. Stoichiometric unfolding of bovine serum albumin by surfactant, as revealed from HPLC/SAXS with online observation of UV–Vis absorption and refractive index. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321089157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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7
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Shih O, Su CJ, Yeh YQ, Liao KF, Chang JW, Wang CA, Wu WR, Jeng US. Data treatment and data storage on the BioSAXS beamline TPS 13A. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321088826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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8
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Yang HC, Lin SW, Ge YC, Huang MY, Yang CH, Liu WM, Duff AP, Wu CM, Lan YK, Su AC, Yeh YQ, Jeng US, Chou PT. Probing protein structures in solution by molecular dynamics simulation and small-angle X-ray scattering. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321089923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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9
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Liao KF, Yeh YQ, Shih O, Su CJ, Wu WR, Wang CA, Liu DG, Chang CH, Chiang LC, Lin CY, Chang CF, Liang CC, Lee TH, Ho MC, Jeng US. A new biological small- and wide-angle X-ray scattering beamline featured in high flux, USAXS and microbeam at Taiwan Photon Source. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321089108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Lin TC, Liao KF, Lian BJ, Lin KT, Chang YJ, Shih O, Yeh YQ, Chen YR, Jeng US. Solution structures of intrinsically disordered dipeptide repeats studied by SAXS and molecular structure simulation. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321085378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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11
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Hsu TW, Liao KF, Yeh YQ, Shih O, Jeng US. Structural characterization of liposomes using integrated methods of HPLC/AF4, UV–Vis absoprtion, refractive index, MALLS, DLS and SAXS. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s010876732108538x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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12
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Chen EHL, Lin KM, Sang JC, Ho MR, Lee CH, Shih O, Su CJ, Yeh YQ, Jeng US, Chen RPY. Condition-dependent structural collapse in the intrinsically disordered N-terminal domain of prion protein. IUBMB Life 2021; 74:780-793. [PMID: 34288372 DOI: 10.1002/iub.2528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/25/2021] [Accepted: 06/27/2021] [Indexed: 11/06/2022]
Abstract
Prion protein is composed of a structure-unsolved N-terminal domain and a globular C-terminal domain. Under limited trypsin digestion, mouse recombinant prion protein can be cleaved into two parts at residue Lys105. Here, we termed these two fragments as the N-domain (sequence 23-105) and the C-domain (sequence 106-230). In this study, the structural properties of the N-domain, the C-domain, and the full-length protein were explored using small-angle X-ray scattering, analytical ultracentrifugation, circular dichroism spectroscopy, and the 8-anilino-1-naphthalenesulfonic acid binding assay. The conformation and size of the prion protein were found to change sensitively under the solvent conditions. The positive residues in the sequence 23-99 of the N-domain were found to be responsible for the enhanced flexibility with the salt concentration reduced below 5 mM. The C-domain containing a hydrophobic patch tends to unfold and aggregate during a salt-induced structural collapse. The N-domain collapsed together with the C-domain at pH 5.2, whereas it collapsed independently at pH 4.2. The positively charged cluster (sequence 100-105) in the N-domain contributed to protecting the exposed hydrophobic surface of the C-domain.
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Affiliation(s)
- Eric H-L Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Kuei-Ming Lin
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
| | - Jason C Sang
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Meng-Ru Ho
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Chih-Hsuan Lee
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan.,Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Rita P-Y Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan.,Neuroscience Program of Academia Sinica, Academia Sinica, Taipei, Taiwan
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Yeh YQ, Su CJ, Wang CA, Lai YC, Tang CY, Di Z, Frielinghaus H, Su AC, Jeng US, Mou CY. Diatom-inspired self-assembly for silica thin sheets of perpendicular nanochannels. J Colloid Interface Sci 2021; 584:647-659. [PMID: 33198979 DOI: 10.1016/j.jcis.2020.10.114] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 10/25/2020] [Accepted: 10/26/2020] [Indexed: 10/23/2022]
Abstract
HYPOTHESIS Multistage silicate self-organization into light-weight, high-strength, hierarchically patterned diatom frustules carries hints for innovative silica-based nanomaterials. With sodium silicate in a biomimetic sol-gel system templated by a tri-surfactant system of hexadecyltrimethylammonium bromide, sodium dodecylsulfate, and poly(oxyethylene-b-oxypropylene-b-oxyethylene) (P123), mesoporous silica nanochannel plates with perpendicular channel orientation are synthesized. The formation process, analogous to that of diatom frustules, is postulated to be directed by an oriented self-assembly of the block copolymer micelles shelled with charged catanionic surfactants upon silication. EXPERIMENTS The postulated formation process for the oriented silica nanochannel plates was investigated using time-resolved small-angle X-ray and neutron scattering (SAXS/SANS) and freeze fracture replication transmission electron microscopy (FFR-TEM). FINDINGS With fine-tuned molar ratios of the anionic, cationic, and nonionic surfactants, the catanionic combination and the nonionic copolymer form charged, prolate ternary micelles in aqueous solutions, which further develop into prototype monolayered micellar plates. The prolate shape and maximized surfactant adsorption of the complex micelles, revealed from combined SAXS/SANS analysis, are of critical importance in the subsequent micellar self-assembly upon silicate deposition. Time-resolved SAXS and FFR-TEM indicate that the silicate complex micelles coalesce laterally into the prototype micellar nanoplates, which further fuse with one another into large sheets of monolayered silicate micelles of in-plane lamellar packing. Upon silica polymerization, the in-plane lamellar packing of the micelles further transforms to 2D hexagonal packing of vertically oriented silicate channels. The unveiled structural features and their evolution not only elucidate the previously unresolved self-assembly process of through-thickness silica nanochannels but also open a new line of research mimicking free-standing frustules of diatoms.
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Affiliation(s)
- Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 30076, Taiwan; Department of Chemistry and Center of Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Chen-An Wang
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Ying-Chu Lai
- Department of Chemistry and Center of Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Chih-Yuan Tang
- Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan
| | - Zhenyu Di
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS, Outstation at MLZ, Garching 85747, Germany
| | - Henrich Frielinghaus
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS, Outstation at MLZ, Garching 85747, Germany
| | - An-Chung Su
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 30076, Taiwan; Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
| | - Chung-Yuan Mou
- Department of Chemistry and Center of Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
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14
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Ting-Hui-Lin, Chia MY, Lin CY, Yeh YQ, Jeng US, Wu WG, Lee MS. Improving immunogenicity of influenza virus H7N9 recombinant hemagglutinin for vaccine development. Vaccine 2020; 37:1897-1903. [PMID: 30857635 DOI: 10.1016/j.vaccine.2018.09.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 09/08/2018] [Accepted: 09/13/2018] [Indexed: 12/11/2022]
Abstract
Human infections of novel avian influenza A virus (H7N9) emerged in early 2013 and caused about 40% case-fatality through 2017. Therefore, development of influenza H7N9 vaccines is critical for pandemic preparedness. Currently, there are three means of production of commercial influenza vaccines: egg-based, mammalian cell-based, and insect cell-based platforms. The insect cell-based platform has the advantage of high speed in producing recombinant protein. In this study, we evaluate the stability and immunogenicity of two different influenza H7 HA expression constructs generated using the baculovirus system, including membrane-based full-length HA (mH7) and secreted ectodomain-based H7 (sH7). The mH7 construct could form an oligomer-rosette structure and had a high hemagglutinin (HA) titer 8192. In contrast to mH7, the sH7 construct could not form an oligomer-rosette structure and did not have HA titer before cross-linking with anti-His antibody. Thermal stability tests showed that the sH7 and mH7 constructs were unstable at 43 °C and 52 °C, respectively. In a mice immunization study, the mH7 construct but not the sH7 construct could induce robust HI and neutralizing antibody titers. In conclusion, further development of the mH7 vaccine candidate is desirable.
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Affiliation(s)
- Ting-Hui-Lin
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County, Taiwan; College of Life Science, National Tsing-Hua University, Hsinchu, Taiwan
| | - Min-Yuan Chia
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County, Taiwan; Department of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Chun-Yang Lin
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan; Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Wen-Guey Wu
- College of Life Science, National Tsing-Hua University, Hsinchu, Taiwan
| | - Min-Shi Lee
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County, Taiwan.
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15
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Shih O, Yeh YQ, Liao KF, Su CJ, Wu PH, Heenan RK, Yu TY, Jeng US. Membrane Charging and Swelling upon Calcium Adsorption as Revealed by Phospholipid Nanodiscs. J Phys Chem Lett 2018; 9:4287-4293. [PMID: 29999328 DOI: 10.1021/acs.jpclett.8b01651] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Direct binding of calcium ions (Ca2+) to phospholipid membranes is an unclarified yet critical signaling pathway in diverse Ca2+-regulated cellular phenomena. Here, high-pressure-liquid-chromatography, small-angle X-ray scattering (SAXS), UV-vis absorption, and differential refractive index detections are integrated to probe Ca2+-binding to the zwitterionic lipid membranes in nanodiscs. The responses of the membranes upon Ca2+-binding, in composition and conformation, are quantified through integrated data analysis. The results indicate that Ca2+ binds specifically into the phospholipid headgroup zone, resulting in membrane charging and membrane swelling, with a saturated Ca2+-lipid binding ratio of 1:8. A Ca2+-binding isotherm to the nanodisc is further established and yields an unexpectedly high binding constant K = 4260 M-1 and a leaflet potential of ca. 100 mV based on a modified Gouy-Chapman model. The calcium-lipid binding ratio, however, drops to 40% when the nanodisc undergoes a gel-to-fluid phase transition, leading to an effective charge capacity of a few μF/cm2.
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Affiliation(s)
- Orion Shih
- National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan
| | - Pei-Hao Wu
- Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 10617 , Taiwan
| | - Richard K Heenan
- STFC ISIS Facility , Rutherford-Appleton Laboratory , Building R3 , Didcot , OX11 0QX , U.K
| | - Tsyr-Yan Yu
- Institute of Atomic and Molecular Sciences, Academia Sinica , Taipei 10617 , Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center , Hsinchu 30076 , Taiwan
- Department of Chemical Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan
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16
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Yang HC, Yang CH, Huang MY, Lu JF, Wang JS, Yeh YQ, Jeng US. Homology Modeling and Molecular Dynamics Simulation Combined with X-ray Solution Scattering Defining Protein Structures of Thromboxane and Prostacyclin Synthases. J Phys Chem B 2017; 121:11229-11240. [PMID: 29168638 DOI: 10.1021/acs.jpcb.7b08299] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A combination of molecular dynamics (MD) simulations and X-ray scattering (SAXS) has emerged as the approach of choice for studying protein structures and dynamics in solution. This approach has potential applications for membrane proteins that neither are soluble nor form crystals easily. We explore the water-coupled dynamic structures of thromboxane synthase (TXAS) and prostacyclin synthase (PGIS) from scanning HPLC-SAXS measurements combined with MD ensemble analyses. Both proteins are heme-containing enzymes in the cytochrome P450 family, known as prostaglandin H2 (PGH2) isomerase, with counter-functions in regulation of platelet aggregation. Currently, the X-ray crystallographic structures of PGIS are available, but those for TXAS are not. The use of homology modeling of the TXAS structure with ns-μs explicit water solvation MD simulations allows much more accurate estimation of the configuration space with loop motion and origin of the protein behaviors in solution. In contrast to the stability of the conserved PGIS structure in solution, the pronounced TXAS flexibility has been revealed to have unstructured loop regions in connection with the characteristic P450 structural elements. The MD-derived and experimental-solution SAXS results are in excellent agreement. The significant protein internal motions, whole-molecule structures, and potential problems with protein folding, crystallization, and functionality are examined.
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Affiliation(s)
- Hsiao-Ching Yang
- Department of Chemistry, Fu Jen Catholic University , New Taipei City 24205, Taiwan
| | - Cheng-Han Yang
- Department of Chemistry, Fu Jen Catholic University , New Taipei City 24205, Taiwan
| | - Ming-Yi Huang
- Department of Chemistry, Fu Jen Catholic University , New Taipei City 24205, Taiwan
| | - Jyh-Feng Lu
- School of Medicine, Fu Jen Catholic University , New Taipei City 24205, Taiwan
| | - Jinn-Shyan Wang
- School of Medicine, Fu Jen Catholic University , New Taipei City 24205, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center , Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center , Hsinchu Science Park, Hsinchu 30076, Taiwan.,Department of Chemical Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan
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17
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Lin YH, Qiu DC, Chang WH, Yeh YQ, Jeng US, Liu FT, Huang JR. The intrinsically disordered N-terminal domain of galectin-3 dynamically mediates multisite self-association of the protein through fuzzy interactions. J Biol Chem 2017; 292:17845-17856. [PMID: 28893908 DOI: 10.1074/jbc.m117.802793] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Revised: 08/23/2017] [Indexed: 12/28/2022] Open
Abstract
Galectins are a family of lectins that bind β-galactosides through their conserved carbohydrate recognition domain (CRD) and can induce aggregation with glycoproteins or glycolipids on the cell surface and thereby regulate cell activation, migration, adhesion, and signaling. Galectin-3 has an intrinsically disordered N-terminal domain and a canonical CRD. Unlike the other 14 known galectins in mammalian cells, which have dimeric or tandem-repeated CRDs enabling multivalency for various functions, galectin-3 is monomeric, and its functional multivalency therefore is somewhat of a mystery. Here, we used NMR spectroscopy, mutagenesis, small-angle X-ray scattering, and computational modeling to study the self-association-related multivalency of galectin-3 at the residue-specific level. We show that the disordered N-terminal domain (residues ∼20-100) interacts with itself and with a part of the CRD not involved in carbohydrate recognition (β-strands 7-9; residues ∼200-220), forming a fuzzy complex via inter- and intramolecular interactions, mainly through hydrophobicity. These fuzzy interactions are characteristic of intrinsically disordered proteins to achieve liquid-liquid phase separation, and we demonstrated that galectin-3 can also undergo liquid-liquid phase separation. We propose that galectin-3 may achieve multivalency through this multisite self-association mechanism facilitated by fuzzy interactions.
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Affiliation(s)
- Yu-Hao Lin
- From the Institute of Biochemistry and Molecular Biology and
| | - De-Chen Qiu
- From the Institute of Biochemistry and Molecular Biology and
| | - Wen-Han Chang
- From the Institute of Biochemistry and Molecular Biology and
| | - Yi-Qi Yeh
- the National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - U-Ser Jeng
- the National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.,the Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, and
| | - Fu-Tong Liu
- the Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Jie-Rong Huang
- From the Institute of Biochemistry and Molecular Biology and .,the Institute of Biomedical Informatics, National Yang-Ming University, Number 155 Section 2 Li-nong Street, Taipei 11221, Taiwan
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18
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Yeh YQ, Liao KF, Shih O, Shiu YJ, Wu WR, Su CJ, Lin PC, Jeng US. Probing the Acid-Induced Packing Structure Changes of the Molten Globule Domains of a Protein near Equilibrium Unfolding. J Phys Chem Lett 2017; 8:470-477. [PMID: 28067527 DOI: 10.1021/acs.jpclett.6b02722] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Using simultaneously scanning small-angle X-ray scattering (SAXS) and UV-vis absorption with integrated online size exclusion chromatography, supplemental with molecular dynamics simulations, we unveil the long-postulated global structure evolution of a model multidomain protein bovine serum albumin (BSA) during acid-induced unfolding. Our results differentiate three global packing structures of the three molten globule domains of BSA, forming three intermediates I1, I2, and E along the unfolding pathway. The I1-I2 transition, overlooked in all previous studies, involves mainly coordinated reorientations across interconnected molten globule subdomains, and the transition activates a critical pivot domain opening of the protein for entering into the E form, with an unexpectedly large unfolding free energy change of -9.5 kcal mol-1, extracted based on the observed packing structural changes. The revealed local packing flexibility and rigidity of the molten globule domains in the E form elucidate how collective motions of the molten globule domains profoundly influence the folding-unfolding pathway of a multidomain protein.
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Affiliation(s)
- Yi-Qi Yeh
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Ying-Jen Shiu
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Wei-Ru Wu
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Po-Chang Lin
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
- Department of Chemical Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan
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19
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Shih O, Yeh YQ, Liao KF, Sung TC, Chiang YW, Jeng US. Oligomerization process of Bcl-2 associated X protein revealed from intermediate structures in solution. Phys Chem Chem Phys 2017; 19:7947-7954. [DOI: 10.1039/c6cp08820a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Linear oligomerization of ditopic BAX-dimers into tri-dimer helical units then into a rod-like structure, as revealed using integrated ESR/SAXS/MD analyses.
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Affiliation(s)
- Orion Shih
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Tai-Ching Sung
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Yun-Wei Chiang
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
- Department of Chemical Engineering
- National Tsing Hua University
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20
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Shiu YJ, Hayashi M, Shih O, Su C, Tsai MY, Yeh YQ, Su CJ, Huang YS, Lin SH, Jeng US. Intrinsic coordination for revealing local structural changes in protein folding–unfolding. Phys Chem Chem Phys 2016; 18:3179-87. [DOI: 10.1039/c5cp06309d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The local dislocations may be tracked relatively easily with respect to the internal rigid rod.
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Affiliation(s)
- Ying-Jen Shiu
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
- Institute of Atomic and Molecular Sciences
- Academia Sinica
| | - Michitoshi Hayashi
- Center for Condensed Matter Sciences
- National Taiwan University
- Taipei 106
- Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Charlene Su
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 106
- Taiwan
| | - Min-Yeh Tsai
- Department of Applied Chemistry
- National Chiao Tung University
- Hsinchu 300
- Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Yu-Shan Huang
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Sheng-Hsien Lin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 106
- Taiwan
- Department of Applied Chemistry
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
- Department of Chemical Engineering
- National Tsing Hua University
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21
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Sung TC, Li CY, Lai YC, Hung CL, Shih O, Yeh YQ, Jeng US, Chiang YW. Solution Structure of Apoptotic BAX Oligomer: Oligomerization Likely Precedes Membrane Insertion. Structure 2015; 23:1878-1888. [PMID: 26299946 DOI: 10.1016/j.str.2015.07.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 07/06/2015] [Accepted: 07/28/2015] [Indexed: 12/23/2022]
Abstract
Proapoptotic BAX protein is largely cytosolic in healthy cells, but it oligomerizes and translocates to mitochondria upon receiving apoptotic stimuli. A long-standing challenge has been the inability to capture any structural information beyond the onset of activation. Here, we present solution structures of an activated BAX oligomer by means of spectroscopic and scattering methods, providing details about the monomer-monomer interfaces in the oligomer and how the oligomer is assembled from homodimers. We show that this soluble oligomer undergoes a direct conversion into membrane-inserted oligomer, which has the ability of inducing apoptosis and structurally resembles a membrane-embedded oligomer formed from BAX monomers in lipid environment. Structural differences between the soluble and the membrane-inserted oligomers are manifested in the C-terminal helices. Our data suggest an alternative pathway of apoptosis in which BAX oligomer formation occurs prior to membrane insertion.
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Affiliation(s)
- Tai-Ching Sung
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ching-Yu Li
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yei-Chen Lai
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chien-Lun Hung
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yun-Wei Chiang
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.
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22
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Abstract
Uniform hollow silica nanospheres (HSNs) synthesized with reverse microemulsion have great application potential as nanoreactors because enzymes or nanocatalysts can be easily encapsulated de novo in synthesis. Water-in-oil (w/o) reverse microemulsions comprising the polymeric surfactant polyoxyethylene (5) isooctylphenyl ether (Igepal CA-520), ammonia and water in a continuous oil phase (alkanes) coalesce into size-tunable silica nanoparticles via diffusion aggregation after the introduction of silica precursors. Here, we elucidate in detail the growth mechanism for silica nanoparticles via nucleation of ammonium-catalyzed silica oligomers from tetraethylorthosilicate (TEOS) and nanoporous aminopropyltrimethoxy silane (APTS) in the reverse microemulsion system. The formation pathway was studied in situ with small-angle X-ray scattering (SAXS). We find a four-stage process showing a sigmoidal growth behavior in time with a crossover from the induction period, early nucleation stage, coalescence growth and a final slowing down of growth. Various characterizations (TEM, N2 isotherm, dynamic light scattering, zeta potential, NMR, elemental analysis) reveal the diameters, scattering length density (SLD), mesoporosity, surface potentials and chemical compositions of the HSNs. Oil phases of alkanes with different alkyl chains are systematically employed to tune the sizes of HSNs by varying oil molar volumes, co-solvent amounts or surfactant mixture ratios. Silica condensation is incomplete in the core region, with the silica source of TEOS and APTS leading to the hollow silica nanosphere after etching with warm water.
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Affiliation(s)
- Cheng-Han Lin
- Center for Condensed Matter Sciences and Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617, Republic of China.
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24
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Liu KH, Zhang Y, Lee JJ, Chen CC, Yeh YQ, Chen SH, Mou CY. Density and anomalous thermal expansion of deeply cooled water confined in mesoporous silica investigated by synchrotron X-ray diffraction. J Chem Phys 2013; 139:064502. [DOI: 10.1063/1.4817186] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Yeh YQ, Lin HP, Tang CY, Mou CY. Mesoporous silica SBA-15 sheet with perpendicular nanochannels. J Colloid Interface Sci 2011; 362:354-66. [PMID: 21807371 DOI: 10.1016/j.jcis.2011.07.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 07/04/2011] [Accepted: 07/06/2011] [Indexed: 11/24/2022]
Abstract
Free-standing thin sheet form of mesoporous silica materials with perpendicular orientation is a much desired materials for its possible applications in catalysis, mask, and separation. A three component amphiphile system of sodium dodecyl sulfate/hexadecyltrimethylammonium bromide/pluronic-123(C(16)TMAB/SDS/P123) was employed to template the condensation of sodium silicates for the formation of SBA(⊥), a thin sheet of SBA-15 with perpendicular nanochannels. SBA(⊥) can be synthesized at SDS/C(16)TMAB=1.5 and T≥40°C and shows pH-dependent morphology. It has uniform pore size ∼9 nm, homogeneous sheet thickness in the range of 60-300 nm and dimension of several microns. We studied in details the structure and morphology of the SBA(⊥) with variation of three experimental parameters: the SDS/C(16)TMAB ratio, the temperature, and the pH condition in the synthetic gel. It is proposed that the mixed surfactants of SDS and C(16)TMAB form catanionic vesicle in which the P123 and silicates are condensed. The balanced interaction of P123/silicate with the narrow confinement under surfactant bi-layers of C(16)TMAB/SDS promoted the formation of perpendicular nanochannels. Low temperature and pH conditions favor stronger segregation of the PPO and PEO-oligosilicate segments in the SBA(⊥) structure which gives the basis of thickness control of the sheet. The control of structure and morphology are discussed with modern theory of microphase separation in block copolymers under confinement.
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Affiliation(s)
- Yi-Qi Yeh
- Department of Chemistry and Center of Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan
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26
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Yeh YQ, Chen BC, Lin HP, Tang CY. Synthesis of hollow silica spheres with mesostructured shell using cationic-anionic-neutral block copolymer ternary surfactants. Langmuir 2006; 22:6-9. [PMID: 16378389 DOI: 10.1021/la052129y] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Hollow silica spheres with mesostructured shells (HSSMS) were prepared with a vesicle template of cetyltrimethylammonium bromide-sodium dodecyl sulfate-Pluronic P123 (C(16)TMAB-SDS-EO(20)PO(70)EO(20)) at a SDS/C(16)TMAB ratio of 0.6-0.8 following a fast silicification in dilute silicate solution at pH approximately 5.0. The mesostructure of the shell is disordered, and the mesopore size is about 5.5-7.5 nm. Moreover, the direction and length of the nanochannels of the shell change with the SDS/C(16)TMAB ratios. A bi-template model, in which the C(16)TMA(+)-DS(-) form the stable bilayer vesicle structure and the P123 copolymers anchored on C(16)TMA(+)-DS(-) vesicle act as the template for the mesoporous silica, was proposed to explain the formation of the HSSMS. This bi-template model can be applied extensively to prepare the HSSMS with different diameters and pore sizes by using other C(n)TMAX-SDS-EO(n)PO(m))EO(n) ternary-surfactant mixtures.
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Affiliation(s)
- Yi-Qi Yeh
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan 701
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